Table 2: List of participating near-IR observatories by longitude and number of observations performed in the various bands.
Observatory d (cm) N_J N_H N_K $N_{\rm tot}$

Campo Imperatore, Italy 110 82 (82) 81 (81) 88 (87) 251 (250)

TIRGO, Switzerland 150 59 (1) 1 (1) 55 (1) 115 (3)

Roque (NOT), La Palma 256 6 (6) 5 (5) 8 (8) 19 (19)

Total 147 (89) 87 (87) 151 (96) 385 (272)

**Table 2:** List of participating near-IR observatories by longitude and number of observations performed in the various bands.
Observatory	d (cm)	N_J	N_H	N_K	$N_{\rm tot}$
Campo Imperatore, Italy	110	82 (82)	81 (81)	88 (87)	251 (250)
TIRGO, Switzerland	150	59 (1)	1 (1)	55 (1)	115 (3)
Roque (NOT), La Palma	256	6 (6)	5 (5)	8 (8)	19 (19)
Total		147 (89)	87 (87)	151 (96)	385 (272)

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	1 Introduction
	2 Long-term observations by the WEBT
	3 The XMM-Newton pointing of January 18-19, 2004
	4 Broad-band spectral energy distribution
	5 Cross-correlations and time delays
	6 Discussion and conclusions
	References